Study on the Heat Disspation System Using Thermoelectric Cooling Based on Energy Harvesting for High-power LED

Abstract

In order to utilize the thermal energy released during the working of high-power light emitting diode (LED), a method combining thermoelectric cooling with energy harvesting is proposed for comprehensively managing the heat energy. In this work, the thermoelectric generator (TEG) as an energy conversion device absorbs heat released by LED, and the thermoelectric cooler (TEC) is used to create a relatively low-temperature environment at the bottom side of TEG. Based on this method, the harvested thermal with induced thermal gradient will be converted into electrical energy. Experimental results demonstrate that the surface temperature of LED can be effectively reduced to 44.5 °C under room temperature of 25 °C with temperature difference of 15.5 K on two sides of TEG. On the basis of energy harvesting technology, the electric energy converted from this thermal energy by TEG can successfully provide long-term power for the blue diode.